My son started to do that at 6 months old too. I have 2 toddler in the house that cause serious distraction. Several cats who love to lay on us while we nurse that have cool hair to pull. I just offered to nurse constantly. He nursed a lot and even at night. My supply stayed the same.

Now at 9 months he nurses on 1 side for 5 min and then is off to play again. I have a nursing necklace that has helped. He now kicks and moves all over and does baby acrobatics now. He is eating less frequently now than at 6 mos. So I understand your fear with losing your supply. I would just offer more often. If he only eats one side, offer the other in an hour. As they grow they tend to space out feedings more.